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void __fastcall TForm1::Button1Click(TObject *Sender)
{
TDateTime dt;
int m=10;//减去的分钟数
dt=Now();
dt=dt-m*1.0/24/60;
ShowMessage(dt);
}
//---------------------------------------------------------------------------
//使用IncMinute()函数
//----------------------------------------------------------------
//加此头文件
#include "DateUtils.hpp"
//----------------------------------------------------------------
void __fastcall TForm1::Button1Click(TObject *Sender)
{
AnsiString ls_time, ls_NewTime;
TDateTime ls_Date ;
//加为正数,减为负数...
int number = -1 ;
ls_time = "2009-05-25 23:12";
ls_Date =FormatDateTime("yyyy-mm-dd hh:mm",ls_time);
ls_NewTime = IncMinute(ls_Date,number).FormatString("yyyy-mm-dd hh:mm");
ShowMessage(ls_NewTime);}